I learned something new today about the PS4 design in the Wii U "Latte" thread:
That's not new this is how it was in the 1st leak.
MEMORY:
2 GByte UMA, pushing for 4 GByte
192 GByte/ sec non-coherent access for e.g. GPU
12 GByte/ sec coherent access for CPU
>50% longer memory latency for CPU/ GPU compared to PC!!!
DXT is lowest bpp texture compression format